Fermi Gamma-ray Space Telescope
FGST Fermi Gamma-ray Space Telescope
What Is FGST?

The newest major space observatory, the Fermi Gamma-ray Space Telescope (FGST, formerly GLAST), is working to unveil the mysteries of the high-energy universe. Launched into orbit on June 11, FGST studies the most energetic particles of light, observing physical processes far beyond the capabilities of earthbound laboratories.

FGST's main instrument, the Large Area Telescope (LAT), operates more like a particle detector than a conventional telescope. From within its 1.8-meter cube housing, the LAT uses 880,000 silicon strips to detect high-energy gamma rays with unprecedented resolution and sensitivity, filling in gaps in understanding left by previous missions, and pushing new boundaries in particle physics and astrophysics.

The SLAC National Accelerator Laboratory, a U.S. Department of Energy (DOE) laboratory operated by Stanford University, managed the development of the LAT and integrated the instrument from hardware fabricated at laboratories around the world. SLAC also runs the Instrument Science Operations Center (ISOC), which processes the LAT data.

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News & Press Releases
  • Word of the Week: Activation
    June 25, 2010
    In space instrument parlance, activation refers to the detailed sequence of commissioning and checkout procedures needed to verify that a spacecraft and its instruments are working as intended after launch. Two years ago today, the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope spacecraft successfully completed activation. read more...
  • Happy Birthday, Fermi Telescope
    June 11, 2010
    Today marks the start of the Fermi Gamma-ray Space Telescope's third year in space. read more...
  • Fermi Telescope Releases First Source Catalog
    May 28, 2010
    The first catalog of high-energy gamma-ray sources detected by the Large Area Telescope on the Fermi Gamma-ray Space Telescope has been published online. read more...

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NASA’s FGST mission is an astrophysics and particle physics partnership, developed in collaboration with the U.S. Department of Energy, along with important contributions from academic institutions and partners in France, Germany, Italy, Japan, Sweden, and the United States.